I rock out to this quite often.
None of those embedded youtubes work for me
-edit-
Actually, all of them except the two last work.
everything is wrapped in gray
i'm focusing on your image
can you hear me in the void?
When I accomplish a task, whether it be downing a beer or completing an important document in work, I always get the Final Fantasy Victory Fanfare in my head.
'Heavens Divide' from MGS: Peace Walker is firmly stuck in my head lately.
Before that, it was 'Make it Bun Dem', as featured in Far Cry 3.
Both songs accompany itense action sequences in their respective games. The scenarios are as wildly different as the songs themselves, but they each fit perfectly. 'Heavens Divide' adds a sense of hope and momentum to a relentless firefight against seemingly dire odds in the face of overwhelming opposition, with the future of the world potentially at stake once again. 'Make it Bun Dem', on the other hand, really fits the mood of swaggering through a weed plantation with a flamethrower, laying waste to slave-trading pirates and their recreational crop.
I generally loathe dubstep, but 'Make it Bun Dem' just works for me.
And lastly...
It's not strictly game music, but a cover of a game track by some of the fine folks at OverClocked Remix. I've listed to it virtually every day since the release of their FFVI album.